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841d22e26e
Even though we can pass in gfp flags to vmalloc it eventually calls pte alloc functions which ignore the caller's flags and use user gfp flags. This risks reclaim re-entering fs paths during allocations in the block cache. These allocs that allowed reclaim deep in the fs was causing lockdep to add RECLAIM dependencies between locks and holler about deadlocks. We apply the same pattern that xfs does for disabling reclaim while allocating vmalloced block payloads. Setting PF_MEMALLOC_NOIO causes reclaim in that task to clear __GFP_IO and __GFP_FS, regardless of the individual allocation flags in the task, preventing recursion. Signed-off-by: Zach Brown <zab@versity.com>